荆门市某小学一起GⅡ型诺如病毒感染聚集疫情调查

Objective To investigate an outbreak of acute gastroenteritis caused by norovirus infection in a primary school in Jingmen City in 2024, analyze the possible risk factors for the outbreak, and take effective measures to control and prevent similar incidents from occurring in the future. Methods The investigation of the outbreak was conducted using field epidemiological methods, and a retrospective cohort study was carried out to assess related risk factors. Samples from relevant personnel and the environment were collected and tested for norovirus nucleic acid. Results This outbreak resulted in a total of 19 cases identified, all of whom were students from Class 6(3). The clinical symptoms of the cases mainly included vomiting(100%). The epidemic curve indicated a pattern of person-to-person transmission. Contact with cases(RR=2.373, 95%CI: 1.104～5.102) was a risk factor for illness. GII norovirus was detected in 5 samples. Conclusion This outbreak was caused by a cluster of GII norovirus infections, which may have been transmitted by contact with fellow students after the index case vomited. The failure to disinfect the vomit and the surfaces of desks and chairs in the classroom according to standard procedures may have led to further spread of the outbreak. It is recommended that schools strengthen the training of staff and students in infectious disease knowledge, strengthen the reporting of infectious diseases and case management.